Further resolution of QIndex LUTS;

This commit resolves further QIndex look up tables to facilitate
experimentation with the quantizer range.

In some cases  rather than remove the look up tables completely
I have created functions that are called once  to populate them
using a formulaic approach base on the actual quantizer.

The use of these functions based on best fit of data from the original
tables does affect the results on some clips but across the derf test
set the effect was broadly neutral.

Change-Id: I8baa61c97ce87dc09a6340d56fdeb681b9345793